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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a2ff49dd0ff41c3d7e1435764dc5571ee13a2bee1577ac74a524f0e0d95665d' 
  AND token = 'loOe6t5SFbOocjH+npF7Z+xT6EBc3jcuUy38ZmK7/Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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