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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4460d5add4ec9442f7dd9d1a3a679441a4db3f7dd4571c96a0f425021e8fdf' 
  AND token = 'fkZBFkr3xFsiUByAsOELJ0RkGGmkL898j9IlQ9kTi58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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