SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48b5c29802694d81e6e240194f421fb827a0d1848e4331442631c05705cf004c' 
  AND token = 'w/Xop8GSQ+Q2jQ8oCPPF9jmo2ZYKu+VXR6rRUuKpSOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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