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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b57d79320562716a9aa3399e60febc6778edde96c029e3df88d42ea67fb95318' 
  AND token = 'sHrGLQg7SyI4DBBGNdwy9d/LGDBLpWX6S9jwoa83eHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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