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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31ce6ea3fda5b8cb3370f4821220161831fb930d82db173a50716740de738309' 
  AND token = 'Z2kPBKgXWpHivesJEPXl9nvwmbmFNDryd2cJw5xHePM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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