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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55160d651880771caca845818b8be51d77a8d7fe04b1c97c27a0a8edff11e663' 
  AND token = 's4+EzrlsoW2n6BmL+f5oTonzyvzYLH9z9DDb9dxty8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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