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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ba5aa813688762449d82438846181311a2e597eb8a4fd1e46cd9c7d5602c10a' 
  AND token = 'MJ6iM7avo6o1SKdzFXRrsIGxzgXpktdPhXgDAm007vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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