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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '786554c0b9b6d56e428ad0a579819b97b03335e0d294a7d6e13005b32720c025' 
  AND token = 'YUHECy91rRBkhJOeQQNf5OhFtNQugBXxa0/CWhQmb2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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