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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd146bbf8045df58af9b95c27b948a0e6f400f9b727f448fee626d219f1854d1' 
  AND token = 'CDCD7d/rPkXz51eg9b1rexSmBfbWrgxU5xgrEkC5phE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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