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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d6315a02602e011a4bc161cb403306a2b97bad3df83368f50cebbbd2a43d8f7' 
  AND token = 'CfGIaKBU6vuPY/h2220oQ7LAKULFSCWxEw07Itjad6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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