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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35f3bcbdc1950c69cdec3215d49ecb5a6bce934aa82f40fbbd7ac469d361f25d' 
  AND token = '4UVBhM1pKlwx6xtYBsgvh9eSwrZ0aDxif7bcfdX0LXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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