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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1245d00b0a3b9072cd3028739742c6fe64b1d5c09053c602e21bce51ae8b7b85' 
  AND token = 'KjLP88ySdAwAnPwWTUN5ABBxw7NHRyuEI6i3MIotrNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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