SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '245ac0b42a9104467bc8a1ae9050fe52b24f027412161c6f030faeca349101e9' 
  AND token = 'vBCkntmjWfQLQTifFgqsbAUKJw/GPQokmFXRj9Sp4vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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