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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a91acd6aff8fa34a8ee2d4cfea8ea59a951bd9db4321b48897de9c55ba8beb' 
  AND token = 'rIgPIOGtMR2X8qrG1jr0LkS3z/EOp3UX9XuYnDnOWuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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