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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a65a3819293d2e563e8132030c16084939206ccc661196f0a93db7e15f96443c' 
  AND token = 'QIrbhQsN2o8WgUFTq48b0LCwDLjr7GQLyHd58f0fsBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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