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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe70f79f472a768d8e039a3969b1b3653a2827c4c6f4dd83e3e18cfd33f008c7' 
  AND token = 'WP1psSPrqGsiPOrDZHVGb6xqxthDM4AimgbENYXLS4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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