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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2500b592f34eb3b89ceed828733f49f2bff1d6f1df4cb9df2e93dca88a5cd6dc' 
  AND token = 'wgLSUvHUkD7Cq8CI9qEH5mNipbmmnsl9+OBXYYf++00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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