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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a653bbedd9af177139955191397a1f04a0eb779c06fec7bb2c8980099163fc0' 
  AND token = 'qh9lwQett/lgqy8rRboBfVNxa4jZEShnU0YAllcysBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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