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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36115749577d6b734bb600f8bbe36ae84be90eb4515073cecf5d15c320253a2a' 
  AND token = 'u1WwouMqACYBOlg1ElHF/l8Y939eAx3v2EVLs5acDJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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