SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee5044a171fd1da9c1334e552b341f2a0433648830d787b2a39c6236f634972d' 
  AND token = 'SnEsmVsnHyC9nh+/K/i89zMHoiAcfYvwCCplCnLSaww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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