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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '975f461dd0696e04227fb6f51f3c69eb8dc9442448e0374d9be7dce26190a6cb' 
  AND token = 'InPcHRyHBOaW7V83iNNx/0r/vWc5XL7WHtsQlb6g6nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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