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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c07dce9b37c28bae4ebe9a6f73df9e91a0ee84d5ca154f20fffc4a8206b7a037' 
  AND token = 'c1gaBOzJVbdiVRFIfVyLLeN8mqgRHIXbXeiuF2pJo2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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