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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e299148f3d34f1ecc544827a4bb30e2832199325ee8ce9d1c62b76b9b6605c3' 
  AND token = 'eO80070lly4PkenaIgLe3holx5M1MmCuakwL9rx2kFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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