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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be17095dfe8ab1baed18fd624f09da2e3cc4d808b8a0396047660ce5db4855fe' 
  AND token = 'fLS0W0BHBMtJmUCQBj8dKZx8uMoPca7ahMd2Se5VRY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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