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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2baac07d8df88fc15b2015ef68239ddcb368860e1599f0ca87add3aeef57937b' 
  AND token = 'pEYDGBDKddDBaPulqH0/W2NHK3LwFxO8q5xkYqzHbJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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