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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2fc42f9f143bf49af317f549cc06b955f532dcf451af940d88cfd7654845987' 
  AND token = 'cKDl5FfK5uwqfmXioyJEstZKp04ILesURbOxD6Bm1WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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