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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dd31db920b5611886c228d1620b7bebf83ec4f08ab9fae1f602795cfdf72337' 
  AND token = 'c6+7ifU8KNcwWSc5T8P47fTTS++ZLed+HGWTLVXYE/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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