SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '449ce2fa874fd18401282c35760dc7b2977d71b585dba02b9b016cf1c4fd65fd' 
  AND token = 'wJlYr3zBP6P2+exGNdJN1SvwB0vuZF2UjG9uxUU4eP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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