SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19287f2bdc339f45e51f3e7a737dce5f00bbb9ef15712c02df3930b945fe409a' 
  AND token = 'qryauQyQgaXB/8aw9SxVIdKE9aBrGOhQZQuXA4B36Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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