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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a770b376f941c42a27e4b9c35687d64d51fb7aff16ad96d34baddecfdc1a4c0' 
  AND token = '1TX2E3IPmYuE5xp918L9IpYxifrOeNXPX1FHJEyzP7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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