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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd917d580967dffccf3a7bf222678982ca84a7de20f074bbd017debff68b8ef1e' 
  AND token = 'ebFQE1yk8iqsNbb3c2vZyOgCBTiYKOn/fy9TRdRsnsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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