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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '314a023daa8f2506f062d91b4515253a6ad18f8ba1183445fdf9f881c989ac07' 
  AND token = 'UqFatTiC+ySezd5MrEibbD0B36oRI1p63z/72h+sRqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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