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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4acd8402eee862cb1e6d834637f49234536f45bf3a54cc17fecb1e4d3dd2c97' 
  AND token = 'kFKjZ5yqyxFgSUQZvMwsEu4X5Bas42Ub5kfAgx5IRxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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