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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '391756535a3a00f0060cc0ca816cdcdb332c263ce8b51a2e3d59517a50d2fedd' 
  AND token = 'b/aF2uiom+G48q0VnQeZoJpmrYlreJ9HHtEP1ghp+uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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