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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b754353c067ca1931dac01e069b7e766ab87a90629434901af07427372b7610' 
  AND token = 'fu1idlASEWsVOBq2g61mNbz2EQWN24AR+EInJqw39o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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