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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f960721de1583199fb9ec0a49217da8fc51c8ac75e5b14be9d09bebeefa380a' 
  AND token = 'OUMSWiZaqRCVZei85noubdY7gCnU3u5Kh+A86eAtqWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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