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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dba5aca0e5d4168b339eeddf938a8893f5ac199011b66ec27c6bc1f6d246cb9' 
  AND token = 'CrU9UrCkBiu91DJoPaL+iM+xPIHyQxRt9O8C/3tGm8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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