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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '916067f72431a40b2ea0e3748fb4aac79b821e5b291b095c4d94d8055c914eca' 
  AND token = 'E8gXBtCQsHxMT9cDUUyPczXfbFOdwQ2cee2yvtyLcA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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