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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e74d414d482ccf36240fff904c7fe49118c0af7b9965b2273a03f2c0b25bb0e' 
  AND token = 'Yui4/5axkpX+Z12d0fRzAhDyMsA7OdA0oALqjagyXEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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