SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84f2aa633d570bd31c3d66399dbdb5356cd44ad0760c781d3d75d905b6e5f89e' 
  AND token = '/rDg4SeHDThBShlmnMQyLZ82SqfaUu3npI8VFYdlpKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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