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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cebb9878fdfa79720763aad953865aee253b1f0b48b8f9bb3a204c963e4408a6' 
  AND token = 'jFYGISTpCrDuWOIlwMJiJbWS9f0WqNaD9vZX94JtNto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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