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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c93600bb6c944f31dea42c6493185b8ab5d57d91ad3e368dcd08efa1e0291508' 
  AND token = 'ujXsgXwd8wOt/PaGOaA0R4AvBUoOZTYr6GeptB39s/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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