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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4caad2fc039389e287f6481999622ed9b8c6a0e40eb78d2de08b5034cf86c61b' 
  AND token = '92fgMgkneGknH3EF/B9Gli+KhuSQ/46T0RhLK9kd++0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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