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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '596171bbc7a9f2fb54e573d6f0b4eef85b1a35bcd8472a2ab58bd1aa20013233' 
  AND token = '6XEY3sLH61kNxU7rYiyi8NDsYDtUiRP4mNiq8xP3VIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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