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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42682bd6d59cf4b61e99eb2eff55c0de422dc56a207ab0721079982f6f07cad9' 
  AND token = 'Ll8Ty6MYdESmKVQscUd4W/IbWELDxoDgQFZplQXo6jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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