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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee8b2f4d226344233ed2ec13d270d53427647b4e491c0ea96edb34fd1a0af24a' 
  AND token = '/BULUiTvbhiKcciptCur5UEZBgiEBIO1rAMcFVvSzw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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