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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '273f959943aa76080da06b1afdef902864335b004fa06bbf78ccfb9f966b70ed' 
  AND token = '62llQPUraiJJJOFVvcMzE65BvnMQFePLx5HFbzf7wb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}