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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '530762871462a3d124086d007a38a59995bcda446a8dbca442874b67f3963e00' 
  AND token = 'Ljzw1gD+86Bf0s4D5ApRWBWy/Dtm0Uss8mA3HSHJEMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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