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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66d830ff32266f2d98d5fcf6b888eb5f103d1f8a57417343840c27d75d1530d6' 
  AND token = 'aUMR9Xyy9kk+d9eS8ccacf1AbQEFpRoKTU0+gK7khMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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