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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25b6a54add254167e147699c7a5ebd81e46ce2b8ab33a23cce4731ef93ce92a6' 
  AND token = 'N3uDSJpHA83BXIlZO4JN2+QNPSq6j7on+vSrAgEbNyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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