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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d109735a25476ad0bda906e9653af7853fb8fffc8776235fcd6ba45ae1f2e70' 
  AND token = 'rgkeH23j/cWCsBEWNoyWX7on7ns5fegCptU5tqvge+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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