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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c779100fda8158aacaacf0954df303f01c016380643e3cd0dfca1501b120dfa6' 
  AND token = 'OJDRe8oMRy34TPs6uCKj8lTUj/e0vawq7EJfMn/2/NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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