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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f41a83925311cf291bd0da774c68694dd2d2a1a11a228006caf7478033bfb6f2' 
  AND token = 'oZXpFUmGDZQai9ZlkFj10Q4oIMz901+jivKq4eLIrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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